A simulation study of electron-cloud instability and beam-induced multipacting in the LHC
In the LHC beam pipe, photoemission and secondary emission give rise to a quasi-stationary electron cloud, which is established after a few bunch passages. The response of this electron cloud to a transversely displaced bunch resembles a short-range wakefield and can cause a fast instability. In addition, beam-induced multipacting of the electrons may lead to an enhanced gas desorption and an associated pressure increase. In this paper the authors report preliminary simulation results of the electron-cloud build-up both in a dipole magnet and in a straight section of the LHC at top energy. The effective wakefield created by the electron cloud translates into an instability rise time of about 25 ms horizontally and 130 ms vertically. This rise time is not much larger than that of the resistive-wall instability at injection energy.
- Research Organization:
- Stanford Univ., Stanford Linear Accelerator Center, CA (US)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (US)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 291055
- Report Number(s):
- SLAC-PUB-7425; ON: DE98059102; IN: CERN LHC Project Report 95; TRN: US200305%%604
- Resource Relation:
- Other Information: Supercedes report DE98059102; PBD: Feb 1997; PBD: 1 Feb 1997
- Country of Publication:
- United States
- Language:
- English
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